China is the world’s least religious country, according to a survey by WIN/Gallup International. Only 9% of the country considers itself religious, while 67% claims to be atheist - more than twice the amount of any other country.

The data, which is based on a survey of more than 66,000 people in 68 countries, suggests a further 23% of Chinese people are non-religious. The results reflect attitudes towards religion in the country, as education rules introduced in China last year said parents should not promote hardline religious beliefs in children or make them dress in specific clothing. The new regulations also banned any form of religious activity in schools.

Sweden, the Czech Republic and the UK are the next least religious countries. In Sweden, 18% of people define themselves as atheist and 55% as non-religious, while the Czech Republic is 25% atheist and 47% non-religious. In the UK, 11% of people claim to be atheist and 58% non-religious.

But there are still countries with largely religious populations: globally 62% of those surveyed classed themselves as religious with Thailand (98%), Nigeria (97%) and Kosovo, India, Ghana, Ivory Coast and Papua New Guinea (all 94%) the most religious countries. Only 1% of people in Thailand and 2% in India define themselves as atheists, while no one in the other least religious countries put themselves in this category.

The research also suggests that many people hold different beliefs without identifying as a member of one particular religion. Seventy-four percent of respondents globally said they believe people have souls and 54% believe in life after death. There is also widespread belief in the idea of heaven (56%) and hell (54%). In Indonesia, Ghana, Nigeria, Kosovo and Azerbaijan, 100% of those surveyed said they believe in God, compared with 16% in China, 22% in Sweden and 29% in Japan.

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Beliefs differ between age and social groups with certain notions diminishing with age: 74% of 18-24-year-olds believe in God, compared with 67% of those aged 65 and older. Similarly, while 60% of the youngest respondents believe in life after death, only 45% of the over 65s do. Those who have lower levels of education and who earn less hold more religious beliefs compared to those who have reached higher education levels and have a higher income, the survey suggests.